# GRASS vector

From gnewarchaeology wiki

GRASS > GRASS vector

## Contents

## Interpolation

### Regularized Spline with tension method

```
# set the region resolution first!
v.surf.rst input=bull_point@marathousa elevation=bull_surf
v.surf.rst --overwrite --verbose input=bull_point@marathousa elevation=bull_surf segmax=30 dmin=0.3
```

### Inverse Distance Squared Weighting method

The interpolated value of a cell is determined by values of nearby data points and the distance of the cell from those input points. In comparison with other methods, numerical approximation allows representation of more complex surfaces (particularly those with anomalous features), restricts the spatial influence of any errors, and generates the interpolated surface from the data points.

## 3D plot

### NVIZ

```
# import csv data
v.in.ascii -z --verbose input=/home/dncgst/project/tsr_rr/data/tsr_fossils-y.csv output=fossil separator=comma skip=1 x=8 y=7 z=9 cat=1
# set the region to match the vectore layer
g.region --verbose vector=fossil@tsr
# adjust the region
g.region n=6 s=2 e=-13 w=-23 t=-3.30 b=-4.60 res3=0.001 tbres=0.001
# make a grid
v.mkgrid --verbose map=grid grid=4,10
# add a base layer
r.mapcalc "bottom = -4.60"
#
```